Age
Relative age dating of the Hamilton places it in the middle and lower Devonian period. In Maryland, it rests conformably atop the Tioga Metabentonite Bed of thinly laminated shale with a thickness less than one foot over the Needmore Shale, and conformably below the Brallier Formation (formerly Woodmont Shale) dark laminated shale in the east, Harrell Shale dark laminated shale in the west, and Tully Limestone in the subsurface of Garrett County. In Pennsylvania it lies atop the Onondaga Formation limestone and shale forming a sharp conformable contact with the Selinsgrove Limestone of that formation, and lies beneath the Portage (Brallier, Harrell, Burket) dark shales of the Harrell Formation.
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